EP2358539B1 - Flexographische auftragung von klebstoffdispersionen - Google Patents

Flexographische auftragung von klebstoffdispersionen Download PDF

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Publication number
EP2358539B1
EP2358539B1 EP09761075.2A EP09761075A EP2358539B1 EP 2358539 B1 EP2358539 B1 EP 2358539B1 EP 09761075 A EP09761075 A EP 09761075A EP 2358539 B1 EP2358539 B1 EP 2358539B1
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EP
European Patent Office
Prior art keywords
adhesive
range
dispersion
stripes
ethylene
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Not-in-force
Application number
EP09761075.2A
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English (en)
French (fr)
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EP2358539A1 (de
Inventor
Bruce Gruber
Monaca Flexer
Mark Monahan
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Wacker Chemical Corp
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Wacker Chemical Corp
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Publication date
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Publication of EP2358539A1 publication Critical patent/EP2358539A1/de
Application granted granted Critical
Publication of EP2358539B1 publication Critical patent/EP2358539B1/de
Not-in-force legal-status Critical Current
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M1/00—Inking and printing with a printer's forme
    • B41M1/02—Letterpress printing, e.g. book printing
    • B41M1/04—Flexographic printing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M3/00—Printing processes to produce particular kinds of printed work, e.g. patterns
    • B41M3/006—Patterns of chemical products used for a specific purpose, e.g. pesticides, perfumes, adhesive patterns; use of microencapsulated material; Printing on smoking articles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M1/00—Inking and printing with a printer's forme
    • B41M1/26—Printing on other surfaces than ordinary paper
    • B41M1/30—Printing on other surfaces than ordinary paper on organic plastics, horn or similar materials

Definitions

  • Carton board is frequently printed with a flexographic process to provide images and/or text that will, upon folding the board and sealing the closures, form images and/or text on the finished carton.
  • ink is transferred from an anilox roller, which picks up the ink from a reservoir and transfers the ink to a pattern roll for subsequent transfer to the carton board.
  • an adhesive In order to seal the carton, an adhesive must also be applied to designated spots on the board so that, when the board is folded into shape and heat is applied, the adhesive softens and seals the closures.
  • adhesives must be deposited on the board at a much higher loading level than printing inks, and thus have typically been applied to the board in a separate operation, using coating equipment capable of delivering these higher loadings.
  • Gravure rollers, doctor blades, nozzles and wheels are commonly used for this purpose.
  • the use of such equipment requires a separate process that in turn often necessitates collecting the printed board and transporting it to the coating process, thus complicating operations and adding cost.
  • methods of applying adhesives to printed board without requiring the use of separate equipment would be a welcome addition to the packaging industry.
  • US 2004/0206446 A1 is concerned with producing printed labels on a continuous stock. For the removal of the unprinted label areas (waste ares) an adhesive is applied to the waste ares, the printed label areas are die cut, and a waste carrier is applied to remove the waste areas.
  • US 6,207,227 B1 deals with the problem of how to prepare a cleaning sheet made of paper or cloth with a thick layer of tacky material like an adhesive on the surface. The thick layer is built from multiple thin layers deposited by multiple stations on a flexographic printing press, which is used only to apply adhesive but not to print.
  • EP 0 712 722 A1 addresses the problem of how to laminate two sheets together in a way that avoids air entrapment between the sheets or extrusion of excess adhesive from the edges. The problem is solved by depositing the adhesive in a particular pattern.
  • the invention provides a process of forming on a substrate an adhesive region comprising an adhesive composition.
  • the process includes:
  • the invention provides a process of applying an adhesive dispersion to a substrate.
  • the substrate will be carton board although any other printable web material (e.g., paper, plastic film, or other) may also be similarly treated.
  • the term "carton board” will be used hereinafter with the understanding that the discussion also applied to other substrates.
  • the method uses a flexographic process, and is conducted at one of the stations of a standard multi-station flexographic printing press which is also printing graphical images such as text or pictures on the substrate. When applied by flexography, the adhesive dispersion is applied at the same time as graphic (ink) printing, saving an application step.
  • the pre-applied adhesive on the final printed board may subsequently be heat activated to seal a carton made from the board.
  • the invention makes it possible to use a flexographic process to apply an adhesive at the loading levels required for effectiveness, levels that are significantly higher than the loading levels of inks delivered by flexographic printing. Adhesives applied in this way may be used in place of hot melt adhesives, for example for sealing paperboard cartons.
  • the inventors have found that application of a sufficient amount of adhesive in an even and well-controlled manner is difficult to achieve by a flexographic process using standard techniques.
  • the majority of combinations of anilox rollers and flexographic plates result either in insufficient adhesive loading, or poor placement control due to pooling of the adhesive resulting from the high volumes required to be laid down on the board.
  • the inventors have found that the use of high-volume anilox rollers in an effort to lay down a sufficient loading of adhesive can itself cause problems.
  • Such rollers are typically highly abrasive, and act somewhat like a metal file on the doctor blade and therefore cause rapid wear.
  • anilox design and flexographic plate configuration enable the user to transfer adhesive dispersion to desired regions of the board evenly and at high loading levels while using anilox rollers of relatively moderate volume.
  • a suitable flexographic plate should provide in the application region an average percent coverage in a certain range in order to provide sufficiently high adhesive loading while avoiding pooling of adhesive.
  • Pooling should be avoided because it results in adhesive dispersion being pushed ahead of the flexographic plate and ending up in areas of the substrate where no adhesive is desired.
  • the pooling problem appears to result at least partially from the presence of the necessarily large loading of adhesive dispersion on the raised portions of the flexographic plate.
  • the inventors have found that, when the plate contacts the substrate, the applied pressure causes most of the adhesive dispersion to be squeezed out of the contact area and flow into adjacent areas. This is essentially the opposite of what happens to an ink during flexographic printing, where most of the ink remains at points of actual contact. However, the inventors have found that nearly the opposite approach must be taken in applying adhesive dispersions in the large amounts needed.
  • flexographic plates for use according to the invention are designed to accommodate the large amount of squeeze-out that results from depositing such high loadings to the board so as so avoid pooling and flooding of the dispersion into unintended areas. If average percent coverage is kept below a certain level, the squeeze-out occurs locally and pooling is avoided.
  • the applied adhesive weight may be at least 8.1 g/m 2 i.e. 2.268 kg/279m 2 (5 Ib/ream i.e., 5 Ib/3000 ft 2 ), typically at least 9.8 g/m 2 (6 Ib/ream), and most typically at least 4.3 g/m 2 (7 Ib/ream)on a dry weight basis. This is a much higher delivery level than for flexographic inks, which are typically delivered at about 1.1 - 2.4 g/m 2 (0.7-1.5 Ib/ream) on a dry weight basis in printed regions.
  • the flexographic plate is designed to lay down adhesive dispersion in one or more regions on the substrate of sufficient size to provide good adhesive performance, such as to secure the closures of a folded carton.
  • the regions regardless of the exact pattern used to apply them, will each typically cover an area of at least 0.39 cm 2 (0.06 In 2 ), and more typically at least 0.65 cm 2 (0.10 in 2 ). Even more typically, the adhesive regions will each cover at least 3.2 cm 2 (0.5 in 2 ), or at least 6.5 cm 2 (1.0 in 2 ), or at least 26 cm 2 (4.0 in 2 ).
  • the regions are typically round or rectangular, but they may be of any shape.
  • the adhesive regions on the substrate are deposited by corresponding adhesive application regions on the flexographic plate. These may be of any shape, but typically circular or rectangular patches will be used. The inventors have found that an average percent coverage in the adhesive application region should typically not exceed 75%. In some cases, the coverage may be at most 65%, or at most 60%, 55% or 50% in order to avoid pooling. To provide sufficient adhesive deposition, the coverage will typically be at least 30%, or at least 35% or 40%. The average coverage is preferably in a range from 35 to 65%, particulary prefered in a range from 40 to 55%.
  • the adhesive application region consists of an unbroken halftone area, wherein the screen value of the halftone is most prefered in a range from 35% to 65%.
  • percent coverage refers to the flexographic plate pattern itself and not to the actual percentage of substrate surface in the adhesive deposition region that ends up bearing adhesive on it. As noted above, much of the adhesive dispersion is squeezed into areas adjacent the actual plate-substrate contact areas, and so the fraction of the area within a given region actually covered by adhesive will typically be significantly larger than that defined by the contact area of the dots in the halftone areas of the flexographic plate.
  • One suitable way of providing the right average coverage is to use a flexographic plate pattern consisting of alternating heavy and light stripes.
  • the average percent coverage across the adhesive application region on the plate is simply the weighted average of the percent coverage in the heavy and light areas. For example, if the heavy stripes have a coverage of 90% (i.e., are produced with a 90% grayscale screen) and the light stripes are of equal width and at 0% coverage, the average coverage is 45%.
  • the stripes may run longitudinally, i.e., parallel to the direction of web motion, or they may run in a transverse direction or at an intermediate angle.
  • the stripes may be straight or curved, and may be narrow without any particular limit.
  • they will be at least 0.4 mm (1/64") wide, or at least 0.8 mm (1/32"), 1.6 mm (1/16"), or 3.2 mm (1/8") wide. Typically, they will be at most 12.7 mm (1/2") wide, or at most 16.4 mm (1/4") wide, In order to avoid pooling.
  • the prefered range is from 0.8 mm (1/32") to 3.2 mm (1/8")
  • the heavy and light stripes may be of the same or different width.
  • the ratio of the width of an individual heavy stripe to that of a light stripe will be at least 1:2, or at least 3:4, or at least 9:10.
  • the ratio will be at most 2:1, or at most 4:3, or at most 10:9. All of these ratios also apply to the total cumulative heavy stripe width across the adhesive application region, relative to the total cumulative light stripe width. In some cases, but not all, the heavy stripes will all be of the same width.
  • the prefered ratio of the width of a heavy stripe to a light stripe is in a range from 1:2 to 2:1.
  • the heavy stripes may be at least 50% solid, or at least 60, 70, 80, or 90% solid, or even 100% solid.
  • the light stripes may be at most 40% solid, or at most 30, 20, or 10% solid, or even 0% solid.
  • the adhesive application region comprises alternating heavy stripes and light stripes, said heavy stripes having a screen value in a range from 50% to 100% and said light stripes having a screen value in a range from 0% to 40%
  • the stripes may be printed at any number of lines per linear inch, using dots of any shape. Typically, about 26 -59 lines/linear cm (65-150 Ipi (lines/linear inch)) will be used. Exemplary dot shapes include elliptical, round, and square. The lines may be at any cell angle, but will typically range from about 17° to 90°.
  • a checkerboard or other pattern may also be used to provide an average coverage within the ranges described above.
  • the percent coverage of the features, and their width, for the checkerboard or other pattern may be as described above with respect to stripes. Or, simple unbroken halftone regions may be applied without being divided into stripes or other such features.
  • Anilox rollers suitable for use according to the invention should be of relatively moderate volume.
  • the volume of a roller is measured in 10 9 ⁇ m 3 (billion cubic microns)/ in 2 (BCM), and suitable values will typically be at least 3.9 x 10 9 ⁇ m 3 /cm 2 (25 BCM), and more typically at least 4.7 x 10 9 ⁇ m 3 /cm 2 (30 BCM).
  • the volume will typically be at most 8.5 x 10 9 ⁇ m 3 /cm 2 (55 BCM), and more typically at most 7.0 x 10 9 ⁇ m 3 /cm 2 or 6.2 x 10 9 ⁇ m 3 /cm 2 (45 or 40 BCM).
  • volume as high as 9.2 x 10 9 ⁇ m 3 /cm 2 or 10.1 x 10 9 ⁇ m 3 may be used in some situations.
  • Any anilox pattern known in the art may be used according to the invention.
  • One suitable exemplary pattern is a trihelical roller.
  • Also suitable are 45° quad or 30° or 60° hexagonal configurations.
  • Suitable CPI (cells per linear inch) values are typically at least 12 cells per linear cm CPC (30 CPI) or at least 14 CPC (35 CPI). Typical upper values are 22 CPC (55 CPI) or 20 CPC (50 CPI). Generally, the value will be in a range from 12 - 18 CPC (30-45 CPI).
  • the adhesive is provided in the form of a dispersion of an adhesive composition.
  • the term "dispersion” is to be understood to include solutions, emulsions, latexes, microemulsions, and the like.
  • the adhesive dispersion will be an aqueous emulsion or dispersion, although other solvents may be used instead or in addition.
  • aqueous means that the solvent is at least 50 wt% water.
  • the adhesive composition by which is meant the entire non-solvent portion of the dispersion, comprises one or more adhesive resins.
  • the presence of other materials such as tackifiers, pigments, dyes, waxes and alkyds may be undesirable to the functioning of the adhesive, and in such cases it may be desirable to exclude any or all of these from the adhesive dispersion.
  • One exemplary adhesive resin dispersion is an ethylene-vinyl acetate (EVA) dispersion sold by Wacker Chemical Corporation of Allentown, PA under the trade name Airflex® EF9900. The inventors have found that this adhesive typically gives little or no surface tack, thus facilitating handling, but provides high adhesive strength in use.
  • EVA polymers may also be used, for example those disclosed in U.S. Pat. No. 7,238,149 .
  • Typical suitable adhesive dispersions have a viscosity from 150 to 1000 mPas (cps), more typically from 300-700 mPas (cps), and typically have a solids content of 45 wt% to 55 wt%.
  • the adhesive polymer used in the dispersion has a crystalline melting point T m in a range from 35°C to 110°C, more typically 50°C to 90°C, as measured by differential scanning calorimetry (DSC) at a heating rate of 20°/min.
  • the polymer will have a tensile storage modulus of at least 0.1 N/cm 2 (1X10 4 dynes/cm 2 ) at 115°C, measured at 6.28 rad/sec as described in U.S. Pat. No. 7,238,149 .
  • the polymer has a heat of fusion ( ⁇ H f ) in a range from 5-100 joules/gram, more typically 15-70 joules/gram, as measured by DSC at a heating rate of 20°/min.
  • ⁇ H f heat of fusion
  • the polymer will comprise from 15 to 90% by weight of polymerized units of vinyl acetate and from 10 to 85% by weight of polymerized units of ethylene, based upon the total weight of the polymer. More typically, there will be from 25 to 80% by weight of vinyl acetate units and from 20 to 75% by weight of ethylene units, based upon the total weight of the polymer.
  • the polymer is an ethylene vinyl acetate adhesive polymer that comprises 15 to 80% by weight of polymerized units of vinyl acetate, 20 to 85% by weight of polymerized units of ethylene, and 0 to 10% by weight of polymerized units of another monomer, based on the total weight of the polymer.
  • the other monomer will be an unsaturated carboxylic acid.
  • alkenoic acids such as acrylic acid, methacrylic acid, crotonic acid, and isocrotonic acid
  • alpha, beta-unsaturated alkenedioic acids such as maleic acid, fumaric acid, and itaconic acid. If present in the ethylene vinyl acetate adhesive polymer, these acids are typically incorporated in an amount of from 0.2 to 10% by weight, more typically 0.5 to 5% by weight.
  • thermoplastic resins provided as aqueous dispersions, such as described in U.S. Pub. Nos. 2005/0100754 A1 and 2007/0292705 A1 .
  • dispersions may include a dispersed polymer phase having a volume average particle size of less than about 5 ⁇ m (microns).
  • Suitable thermoplastic resins include ethylene-based polyolefins and propylene-based polyolefins, including copolymers.
  • the adhesive dispersion may be applied using a standard flexographic printing press.
  • the process is performed at a station on a multi-station flexographic printing press during a press run that additionally produces graphic images on the substrate.
  • the carton board will typically be passed through a drying oven to evaporate the solvent and provide the dry adhesive composition in the form of adhesive regions on the board.
  • the shapes of the adhesive regions substantially match those of the adhesive application regions on the flexographic plate.
  • a flexographic plate was prepared, having a series of 25.4 mm x 254 mm (1" x 10") solid rectangles oriented longitudinally, as well as 25.4 mm x 25.4 mm (1" x 1") and 12.7 mm x 12.7 mm (1 ⁇ 2" x 1 ⁇ 2”) solid squares, all at a 100% screen value.
  • the plate was mounted on a 40.64 cm (16") COMMANDER® flexographic printing press, available from Comco Machinery Inc. of Milford, OH equipped with a 50-line trihelical anilox roller of nominal 56-65 BCM (8.7 to 10.1 x 10 9 ⁇ m 3 (billion cubic microns) /cm 2 ) capacity, obtained from Harper Corporation of Charlotte, NC.
  • the expected coating weight was about 14.6 g/m 2 (9 Ib/ream) .
  • the adhesive dispersion was Airflex® EF 9900, adjusted to 53% solids, applied to SBS board at a line speed of 36.6 m/min (120 ft/min) and then run through a hot air dryer.
  • the actual measured dry coating weight was only 5.4 g/m 2 (3.3 lb/ream), measured in the interior of the printed rectangles. There was a large buildup of adhesive at the edges of the rectangle, due to pooling of squeezed-out adhesive dispersion resulting from the pressure applied to the flexographic plate during the application process.
  • a flexographic plate was prepared, bearing several approximately 25.4 mm x 254 mm (1" x 10") rectangles consisting of longitudinal 100% screen stripes alternating with 0% screen stripes (i.e., blank areas). The outermost stripes were the 100% screen stripes.
  • the rectangles were oriented longitudinally, and SBS board was treated as in Comparative Example 1.
  • the measured coating weight was 9.8 g/m 2 (6 Ib/ream), much higher than that obtained in Comparative Example 1 using solid 100% screen rectangles.
  • the resulting patterns showed only a very small amount of adhesive extending beyond the leading edge of the rectangles, and noticeably less buildup along the long sides of the rectangles. Instead, significant amounts of adhesive dispersion appeared to have flowed into the blank areas adjacent the 100% screen stripes, with relatively little adhesive dispersion remaining in the areas where the 100% screen stripes actually contacted the board.
  • a flexographic plate was prepared, bearing three approximately 25.4 mm x 254 mm (1" x 10") rectangles consisting of five 3.2 mm (1/8") longitudinal 100% screen stripes alternating with four 3.2 mm (1/8") 30% screen stripes. The outermost stripes were the 100% screen stripes.
  • the rectangles were prepared at values of 39, 52 and 59 lines per cm, Ipc (100, 133 and 150 Ipi) and were oriented longitudinally.
  • SBS board was treated as in Comparative Example 1, but at a line speed of 43 m/min (140 ft/min). There was a large buildup of adhesive at the edges of the rectangle. Significant pooling was found at the leading edges of the rectangles, resulting in the presence of a tapered pattern of adhesive extending about 25.4 mm (one inch) beyond the leading edges.
  • a flexographic plate was prepared, bearing four approximately 25.4 mm x 254 mm (1" x 10") rectangles.
  • Two rectangles consisted of 3.2 mm (1/8") longitudinal 80% screen stripes alternating with 3.2 mm (1/8") 20% screen stripes. In one rectangle the outermost stripes were the 80% screen stripes, i.e. five 80% stripes alternating with four 20% stripes, and in the other rectangle the pattern was reversed. The other two rectangles were analogous, but had values of 90% and 30%. All four rectangles were prepared at a value of 52 Ipc (133 Ipi), and were oriented longitudinally.
  • SBS board was treated as in Comparative Example 1, but at a line speed of 43 m/min (140 ft/min). There was a large buildup of adhesive at the edges of the rectangle. Significant pooling was found at the leading edges of the rectangles, resulting in the presence of a tapered pattern of adhesive extending about 25.4 mm (one inch) beyond the leading edges.
  • a flexographic plate was prepared, bearing four approximately 25.4 mm x 254 mm (1" x 10") rectangles as in Comparative Example 4, except that the value was 59 Ipc (150 Ipi). Testing was performed in the same manner as Comparative Example 1, but at a line speed of 43 m/min (140 ft/min). There was a large buildup of adhesive at the edges of the rectangle. Significant pooling was found at the leading edges of the rectangles, resulting in the presence of a tapered pattern of adhesive extending nearly 25.4 mm (an inch) beyond the leading edges.
  • a flexographic plate was prepared, bearing four approximately 25.4 mm x 254 mm (1" x 10") rectangles. Two rectangles consisted of ten 1.6 mm (1/16") longitudinal 50% screen stripes alternating with nine 1.6 mm (1/16") 0% screen stripes, with the heavy stripes outermost. One was prepared at 39 Ipc (100 Ipi), and the other at 59 Ipc (150 Ipi). The other two rectangle were analogous, but had values of 75% and 0%. All four rectangles were oriented longitudinally. SBS board was treated as in Comparative Example 1, but at a line speed of 43 m/min (140 ft/min). There was no noticeable buildup of adhesive at the edges of the rectangle.
  • a flexographlc plate was prepared, bearing two approximately 25.4 mm x 254 mm (1" x 10") rectangles.
  • the rectangles consisted of ten 1.6 mm (1/16") longitudinal 50% screen stripes alternating with nine 0% screen stripes , with the heavy stripes outermost.
  • the two rectangles had 0% stripes of 0.8 mm (1/32") and 1.6 mm (1/16") width, respectively.
  • the heavy stripes were prepared at 39 Ipc (100 Ipi), and the rectangles were oriented longitudinally.
  • SBS board was treated as in Comparative Example 1, providing a coating weight of > 8.1 g/m 2 (> 5 Ibs/ream) for all rectangles.
  • the rectangles showed no noticeable buildup of adhesive at the edges of the rectangle. Essentially no pooling was found at the leading edges of the rectangles, and essentially no adhesive extended beyond the leading edges.
  • a cardboard cutout designed to be folded into a carton to contain two golf balls was treated an a flexographic press as in Example 1, except for the following differences.
  • Auxiliary drying was performed with a XericWeb 5.9 cm (15") (I) X 4.7 cm (12") (w) dryer mounted with the width in the machine direction, containing 9 medium-wave infrared lamps with impingement air.
  • the anilox roller was a 64 BCM (9.9 x 10 9 ⁇ m 3 (billion cubic microns) /cm 2 ) quad roller, and the press speed was approximately 92 m/min (300 ft/min).
  • the adhesive was laid down at several locations on the foldable cardboard cutout using a flexographic plate pattern that consisted of alternating 1.6 mm (1/16") heavy and light stripes at 100% and 0%, respectively. Deposition of the adhesive was found to be very precise, with essentially no adhesive showing up in unintended places on the cutout. It appeared that higher press speeds would have been possible, but the drying capacity of the equipment was not able to handle such higher speeds.
  • a flexographic plate was prepared, having a 5 x 3 array of rectangular blocks representing five different halftone dot patterns for each of three anilox settings. No heavy and light stripes were used, but rather the spaces between the dots served the same function as the light stripes. That is, they accommodated adhesive dispersion that was squeezed out of the contact area where a dot pressed against the board.
  • the patterns were as follows:
  • the plate was mounted on a Mark Andy 4150, 5-station flexographic press, equipped with a banded anilox roller obtained from Harper Corporation.
  • the roller had the following three bands, all in a 45° quad design:
  • Adhesive dispersion (the same as used in Comparative Example 1) was applied at the 3 rd station of the press, which was run at 30.5 m/min (100 ft/min). Coating weights were estimated from coating thicknesses, which were measured by micrometer. The micrometer readings and estimated weights were as follows.
  • Pattern # 1 and related pattern #2 provided the best overall results, due to the high adhesive delivery. For these patterns, significant amounts of adhesive dispersion appeared to have flowed into the blank areas adjacent the dots that made up the rectangles. However, essentially no adhesive dispersion flowed into the lined area of pattern #2 or #5, and thus, there was essentially no pooling and resultant flow of adhesive dispersion into areas ahead of the leading edge of the halftone rectangles. The variations in anilox configuration did not have a great effect in these runs. Thus, flexographic plates employing adhesive application regions of undivided halftone areas within a suitable percent screen range can provide good adhesive delivery according to the invention.

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  • Life Sciences & Earth Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Pest Control & Pesticides (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
  • Printing Methods (AREA)
  • Adhesives Or Adhesive Processes (AREA)

Claims (17)

  1. Verfahren zur Bildung eines eine Klebstoffzusammensetzung umfassenden Klebebereichs auf einem Substrat, bei dem es sich um ein bedruckbares Bahnmaterial handelt, bei dem man:
    a) eine Dispersion der Klebstoffzusammensetzung in einem Lösungsmittel auf eine Anilox-Walze auf einer Flexodruckmaschine aufbringt, wobei die Klebstoffzusammensetzung ein klebendes Polymer umfasst;
    b) die Anilox-Walze mit einer Flexodruckplatte in Berührung bringt, um einen Teil der Dispersion darauf zu übertragen, wobei die Flexodruckplatte einen Klebstoffapplikationsbereich mit einer weitgehend der Form des Klebstoffbereichs auf dem Substrat entsprechenden Form aufweist;
    c) die Flexodruckplatte mit dem Substrat in Berührung bringt, um die Dispersion auf das Substrat zu übertragen; und
    d) die Dispersion auf dem Substrat trocknet, um den Klebstoffbereich zu bilden;
    wobei das Verfahren an einer der Stationen einer standardmäßigen Flexodruckmaschine mit mehreren Stationen durchgeführt wird und
    wobei die Klebstoffdispersion während eines Druckmaschinenlaufs, bei dem zusätzlich graphische Bilder auf dem Substrat erzeugt werden, aufgebracht wird und
    wobei der Klebstoffapplikationsbereich eine durchschnittliche Abdeckung von 35% bis 65% aufweist und
    wobei der Klebstoffapplikationsbereich alternierende schwere Streifen und leichte Streifen aufweist, wobei die schweren Streifen einen Rasterwert im Bereich von 50% bis 100% aufweisen und die leichten Streifen einen Rasterwert im Bereich von 0% bis 40% aufweisen, und
    wobei die Anilox-Walze ein Volumen im Bereich von 3, 9 x 109 µm3/cm2 bis 10, 1 x 109 µm3/cm2 (25 BCM bis 65 BCM mit BCM = Milliarde Kubikmikron (billion cubic microns) /in2) aufweist.
  2. Verfahren nach Anspruch 1, bei dem der Klebstoffapplikationsbereich aus einer ungebrochenen Rasterfläche besteht.
  3. Verfahren nach Anspruch 2, bei dem der Rasterwert des Rasters im Bereich von 35% bis 65% liegt.
  4. Verfahren nach einem der vorhergehenden Ansprüche, bei dem das Verhältnis der Breite eines schweren Streifens zu einem leichten Streifen im Bereich von 1:2 bis 2:1 liegt.
  5. Verfahren nach einem der vorhergehenden Ansprüche, bei dem die schweren und leichten Streifen jeweils eine Breite im Bereich von 0,8 mm (1/32'') bis 3,2 mm (1/8") aufweisen.
  6. Verfahren nach einem der vorhergehenden Ansprüche, bei dem die schweren und leichten Streifen parallel zur Richtung der Bahnbewegung auf der Presse orientiert sind.
  7. Verfahren nach einem der vorhergehenden Ansprüche, bei dem die Anilox-Walze ein Volumen im Bereich von 4, 7 x 109 µm3/cm2 bis 6,2 x 109 µm3/cm2 (30 BCM bis 40 BCM mit BCM = Milliarde Kubikmikron (billion cubic microns)/in2) aufweist.
  8. Verfahren nach einem der vorhergehenden Ansprüche, bei dem die Klebstoffzusammensetzung in dem Klebebereich in einer Beladung von mindestens 8,1 g/m2 (5 1b/3000 ft2) vorliegt.
  9. Verfahren nach einem der vorhergehenden Ansprüche, bei dem das Substrat Kartonpappe umfasst.
  10. Verfahren nach einem der vorhergehenden Ansprüche, bei dem es sich bei der Disperion um eine wässrige Dispersion handelt.
  11. Verfahren nach einem der vorhergehenden Ansprüche, bei dem die Dispersion eine Viskosität im Bereich von 150 bis 1000 mPas (cPs) aufweist.
  12. Verfahren nach einem der vorhergehenden Ansprüche, bei dem die Klebstoffzusammensetzung ein auf Ethylen basierendes Polyolefin oder ein auf Propylen basierendes Polyolefin umfasst.
  13. Verfahren nach einem der Ansprüche 1-11, bei dem das klebende Polymer ein Ethylen-Vinylacetat-Polymer umfasst.
  14. Verfahren nach Anspruch 13, bei dem das Ethylen-Vinylacetat-Polymer einen Kristallschmelzpunkt im Bereich von 35°C bis 110°C und einen Zugmodul von mindestens 0,1 N/cm2 (1 x 104 dyn/cm2) bei 115°C aufweist.
  15. Verfahren nach Anspruch 13 oder Anspruch 14, bei dem das Ethylen-Vinylacetat-Polymer eine Schmelzwärme im Bereich von 5-100 Joule/Gramm aufweist.
  16. Verfahren nach einem der Ansprüche 13-15, bei dem das Ethylen-Vinylacetat-Polymer 15 bis 90 Gew.-% polymerisierte Vinylacetat-Einheiten und 10 bis 85 Gew.-% polymerisierte Ethylen-Einheiten, bezogen auf das Gesamtgewicht des Polymers, umfasst.
  17. Verfahren nach einem der Ansprüche 13-16, bei dem das Ethylen-Vinylacetat-Polymer 15 bis 80 Gew.-% polymerisierte Vinylacetat-Einheiten und 20 bis 85 Gew.-% polymerisierte Ethylen-Einheiten und 0,2 bis 10 Gew.-% polymerisierte Einheiten einer ungesättigten Carbonsäure, bezogen auf das Gesamtgewicht des Polymers, umfasst.
EP09761075.2A 2008-11-18 2009-11-11 Flexographische auftragung von klebstoffdispersionen Not-in-force EP2358539B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US12/273,115 US8623166B2 (en) 2008-11-18 2008-11-18 Flexographic application of adhesive dispersions
PCT/US2009/063980 WO2010059472A1 (en) 2008-11-18 2009-11-11 Flexographic application of adhesive dispersions

Publications (2)

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EP2358539A1 EP2358539A1 (de) 2011-08-24
EP2358539B1 true EP2358539B1 (de) 2013-08-21

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EP09761075.2A Not-in-force EP2358539B1 (de) 2008-11-18 2009-11-11 Flexographische auftragung von klebstoffdispersionen

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US (1) US8623166B2 (de)
EP (1) EP2358539B1 (de)
JP (1) JP2012509172A (de)
CN (1) CN102216086B (de)
BR (1) BRPI0921508A2 (de)
ES (1) ES2436435T3 (de)
WO (1) WO2010059472A1 (de)

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Publication number Publication date
BRPI0921508A2 (pt) 2016-01-19
JP2012509172A (ja) 2012-04-19
US8623166B2 (en) 2014-01-07
CN102216086B (zh) 2014-05-07
EP2358539A1 (de) 2011-08-24
CN102216086A (zh) 2011-10-12
US20100122770A1 (en) 2010-05-20
ES2436435T3 (es) 2014-01-02
WO2010059472A1 (en) 2010-05-27

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